Introduction to PWN (1) binary Basics

1 PWN What is it? ？

• Crack 、 Use success （ Binary vulnerability of the program ）

• Break through （ equipment 、 The server ）

• control （ equipment 、 The server ）

• exploit： Scripts and scenarios for attacks

• payload： Attack load , Yes, the target process is hijacked to control the flow of data

• shellcode： Call the target's shell Code

2 Compiling and linking of programs

from C The generation process from source code to executable file

• compile ： from C Language code generates assembly code .
• assembly ： Generating machine code from assembly code .
• link ： Link the target files of multiple machine codes into an executable file .
  
  Convert code to assembly code ：

gcc -S test.c

3 Linux Executable file format under ELF

What is an executable ？

• In a broad sense ： The data in the file is the file of executable code （out exe sh py）
• narrow sense ： The data in the file is the file of machine code （out exe dll so）
  Classification of executable files
• Windows：PE（Portable Executable）
  • Executable program exe
  • Dynamic link library dll
  • Static link library lib
• Linux：ELF（Executable and LInkable Format）
  • Executable program out
  • Dynamic link library so
  • Static link library a
    
    
    
    

4 Process virtual address space

All local variables are stored on the stack .

5 Program loading and process execution

6 ×86&amd64 Compilation Overview

Little knowledge points

• vim The command to replace a file with a binary file %!xxd, Restored commands %!xxd - r.